Table 4 Friction coefficient of the key contact surface of bolt.

From: Analysis of the influence of geometric accuracy on the preload and stress of engine connecting rod bolts

Sample number

µw

µs

1

0.099

0.203

2

0.130

0.197

3

0.164

0.254

4

0.161

0.189

5

0.106

0.182

Mean value

0.132

0.205

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